<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <!-- 准备好一个“容器” -->
    <div id="test"></div>

    <!-- 引入react核心库 -->
    <script type="text/javascript" src="../js/react.development.js"></script>
    <!-- 引入react-dom，用于支持react操作DOM -->
    <script type="text/javascript" src="../js/react-dom.development.js"></script>
    <!-- 引入babel，用于将jsx转为js -->
    <script type="text/javascript" src="../js/babel.min.js"></script>

    <script type="text/babel">
        //创建组件
        class Login extends React.Component {
            handleSubmit = (event) => {
                event.preventDefault() //阻止表单提交
                const {username, password} = this
                alert(`你输入的用户名是：${username.value},你输入的密码是：${password.value}`)
            }

            render() {
                return (
                    <form onSubmit={this.handleSubmit}>
                        用户名：<input ref={c => this.username = c} type="text" name="username"/>
                        密码：<input ref={c => this.password = c} type="password" name="password"/>
                        <button>登录</button>
                    </form>
                )
            }
        }

        //渲染组件
        ReactDOM.render(<Login/>, document.getElementById('test'))
    </script>

</body>
</html>